Power control method and terminal equipment

ABSTRACT

A user equipment includes: a transmitter configured to transmit uplink signals; and a processor circuit coupled with the transmitter, the processor circuit configured to: drop a Sounding Reference Signal (SRS) transmission when a total transmission power exceeds maximum output power of the user equipment and the user equipment needs to transmit a Physical Random Access Channel (PRACH) signal in a secondary serving cell in parallel with the SRS transmission in a symbol on a subframe of a different serving cell; and adjust transmission power of a Physical Uplink Shared Channel (PUSCH) signal until an adjusted total transmission power is less than or equal to the maximum output power of the user equipment when the user equipment needs to transmit a PRACH signal in a secondary serving cell in parallel with a PUSCH signal in a different serving cell within a symbol.

CROSS-REFERENCE TO RELATED APPLICATIONS

This is a continuation of U.S. application Ser. No. 15/044,427, whichwas filed Feb. 16, 2016, now pending, which is a continuation of U.S.application Ser. No. 14/162,034 which was filed Jan. 23, 2014, now U.S.Pat. No. 9,307,503, issued Apr. 5, 2016, which claims priority toInternational Application No. PCT/CN2011/077789, filed on Jul. 29, 2011,the contents of each are herein wholly incorporated by reference.

TECHNICAL FIELD

The present invention relates to the field of communications, and inparticular to a power control method and terminal equipment in case ofpower of a terminal being limited.

BACKGROUND ART

In a long-term evolution (LTE) system, power control methods whenterminal equipment transmits a physical uplink share channel (PUSCH), aphysical uplink control channel (PUCCH), an uplink sounding referencesignal (SRS) and a physical random access channel (PRACH) are defined(3GPP TS 36.213 v 8.6.0), wherein,

a formula of power control of the PUSCH is:P _(PUSCH)(i)−min{P _(MAX),10 log₁₀(M _(PUSCH)(i))+P _(O) _(_)_(PUSCH)(j)+α(j)·PL+Δ _(TF)(i)+f(i)}[dBm]  (1);

a formula of power control of the PUCCH is:P _(PUCCH)(i)=min{P _(MAX) ,P ₀ _(_) _(PUCCH) +PL+h(n _(CQI) ,n_(HARQ))+Δ_(F) _(_) _(PUCCH)(F)+g(i)}[dBm]  (2);

a formula of power control of the SRS is:P _(SRS)(i)=min{P _(MAX) ,P _(SRS) _(_) _(OFFSET)+10 log₁₀(M _(SRS))+P_(O) _(_) _(PUSCH)(j)+α·PL+f(i)}[dBm]  (3); and

a formula of power control of the PRACH is:P _(PRACH)=min{P _(CMAX,c)(i),PREAMBLE_RECEIVED_TARGET_POWER+PL _(c)}[dBm]  (4).

In the LTE system, the same terminal equipment does not transmit aPUSCH, a PUCCH and a PRACH in the same subframe at the same time.Meanwhile, the same terminal equipment does not transmit an SRS and aPUSCH, an SRS and a PUCCH, and an SRS and a PRACH, in the sameorthogonal frequency division multiplexing (OFDM) symbol at the sametime. And on the other hand, it can be seen from the formulae of powercontrol of the PUSCH, PUCCH, PRACH and SRS that if the transmissionpower of the uplink signals exceeds the configured maximum output power(PCMAX) of the terminal equipment, that is, overflow of the output powerof the terminal equipment occurs, the transmission power of the terminalequipment used in transmitting the uplink signals will be equal to theconfigured maximum output power (PCMAX) of the terminal equipment.

In Rel-10 of an LTE-Advanced (LTE-A) system, a carrier aggregationtechnology is used, and transmission power of uplink signals isindependently controlled in each serving cell, with the power controlmethods being as follows:

power control of a PUSCH:

when only PUSCHs are transmitted in a serving cell c, the transmissionpower of the PUSCHs of the terminal equipment in an i-th subframe in theserving cell c is:

$\begin{matrix}{{P_{{PUSCH},c}(i)} = {\min{\begin{Bmatrix}{{P_{{CMAX},c}(i)},} \\{{10{\log_{10}\left( {M_{{PUSCH},c}(i)} \right)}} + {P_{{O\;\_\;{PUSCH}},c}(j)} + {{\alpha_{c}(j)} \cdot {PL}_{c}} + {\Delta_{{TF},c}(i)} + {f_{c}(i)}}\end{Bmatrix}\lbrack{dBm}\rbrack}}} & (5)\end{matrix}$

when PUSCHs and PUCCHs are transmitted in the serving cell c, thetransmission power of the PUSCHs of the terminal equipment in the i-thsubframe in the serving cell c is:

$\begin{matrix}{{P_{{PUSCH},c}(i)} = {\min{\begin{Bmatrix}{{10{\log_{10}\left( {{{\hat{P}}_{{CMAX},c}(i)} - {{\hat{P}}_{PUCCH}(i)}} \right)}},} \\{{10{\log_{10}\left( {M_{{PUSCH},c}(i)} \right)}} + {P_{{O\;\_\;{PUSCH}},c}(j)} + {{\alpha_{c}(j)} \cdot {PL}_{c}} + {\Delta_{{TF},c}(i)} + {f_{c}(i)}}\end{Bmatrix}\lbrack{dBm}\rbrack}}} & (6)\end{matrix}$

power control of a PUCCH:

when PUCCHs are transmitted in the serving cell c, the transmissionpower of the PUCCHs of the terminal equipment in the i-th subframe inthe serving cell c is:

$\begin{matrix}{{P_{PUCCH}(i)} = {\min{\begin{Bmatrix}{{P_{{CMAX},c}(i)},} \\{P_{0\;\_\;{PUCCH}} + {PL}_{c} + {h\left( {n_{CQI},n_{HARQ},n_{SR}} \right)} + {\Delta_{F\;\_\;{PUCCH}}(F)} + {\Delta_{TxD}\left( F^{\prime} \right)} + {g(i)}}\end{Bmatrix}\lbrack{dBm}\rbrack}}} & (7)\end{matrix}$

power control of an SRS:

when SRSs are transmitted in the serving cell c, the transmission powerof the SRSs of the terminal equipment in the i-th subframe in theserving cell c is:P _(SRS,c)(i)=min{P _(CMAX,c)(i),P _(SRS) _(_) _(OFFSET,c)(m)+10 log₁₀(M_(SRS,c))+P _(O) _(_) _(PUSCH,c)(j)+α_(c)(j)·PL _(c) +f_(c)(i)}[dBm]  (8)

The method for controlling transmission power of a PRACH is the same asthat of the LTE system, which are omitted herein.

As a carrier aggregation technology is used, when the terminal equipmentis configured with multiple serving cells, there will appear in the samesubframe, and multiple PUSCHs are transmitted at the same time (as shownin FIG. 1(a)), or PUSCHs and PUCCHs are transmitted at the same time (asshown in FIG. 1(b)), in different serving cells. And on the other hand,as the capability of the terminal equipment is enhanced, the terminalequipment is able to transmit PUSCHs and PUCCHs in the same subframe ina primary serving cell at the same time (as shown in FIG. 1(c)).

If the above case occurs, that is, the terminal equipment needs totransmit multiple PUSCHs, or the terminal equipment needs to transmitPUSCHs and PUCCHs, in the same subframe at the same time, a case willoccur where the sum of transmission power of multiple PUSCHs is greaterthan the configured maximum output power of the terminal equipment, orthe sum of transmission power of the PUSCHs and PUCCHs is greater thanthe configured maximum output power of the terminal equipment. In orderto direct allocation of the transmission power of the terminal equipmentin such a case, a power control method in case of transmission power ofterminal equipment being limited is defined in standardization of theLTE-A system. In which,

when multiple PUSCHs with no uplink control information (UCI) only needto be transmitted at the same time, the terminal equipment calculatesfirst the transmission power needed by PUSCHs in each serving cellaccording to formula (5); and if the total transmission power obtainedat this moment exceeds the maximum output power of the terminalequipment, the terminal equipment decreases the transmission power ofeach PUSCH by equivalent share, until that the total transmission poweris less than or equal to the maximum output power of the terminalequipment is ensured;

when PUSCHs with no UCI and PUCCHs need to be transmitted at the sametime, the terminal equipment calculates first the transmission powerneeded by the PUSCHs in a serving cell where only PUSCHs are transmittedaccording to formula (5), and calculates the transmission power neededby the PUSCHs and the PUCCHs in a serving cell where PUSCHs and PUCCHsare transmitted at the same time according to formulae (6) and (7); andif the total transmission power obtained at this moment exceeds themaximum output power of the terminal equipment, the terminal equipmentfirst ensures that the transmission power of the PUCCHs is satisfied,and then decreases the transmission power in each PUSCH with no UCI byequivalent share, until that the total transmission power is less thanor equal to the maximum output power of the terminal equipment isensured;

when PUSCHs with no UCI and PUSCHs with UCI need to be transmitted atthe same time, the terminal equipment calculates first the transmissionpower needed by the PUSCHs in each serving cell according to formula(5); and if the total transmission power obtained at this moment exceedsthe maximum output power of the terminal equipment, the terminalequipment first ensures that the transmission power of the PUSCHs withUCI is satisfied, and then decreases the transmission power in eachPUSCH with no UCI by equivalent share, until that the total transmissionpower is less than or equal to the maximum output power of the terminalequipment is ensured;

when PUCCHs, PUSCHs with no UCI and PUSCHs with UCI need to betransmitted at the same time, the terminal equipment calculates firstthe transmission power needed by the PUSCHs in a serving cell where onlyPUSCHs are transmitted according to formula (5), and calculates thetransmission power needed by the PUSCHs and the PUCCHs in a serving cellwhere PUSCHs and PUCCHs are transmitted at the same time according toformulae (6) and (7); and if the total transmission power obtained atthis moment exceeds the maximum output power of the terminal equipment,the terminal equipment first ensures that the transmission power of thePUCCHs is satisfied and secondly ensures that the transmission power ofthe PUSCHs with UCI is satisfied, and then decreases the transmissionpower in each PUSCH with no UCI by equivalent share, until that thetotal transmission power is less than or equal to the maximum outputpower of the terminal equipment is ensured.

In Rel-10 of the LTE-A system, when a terminal is configured withmultiple serving cells, the terminal equipment uses the same uplink timeadvance value in transmitting uplink signals in all the serving cells,so as to ensure uplink synchronization. An initial value of the timeadvance is obtained by performing random access in a primary servingcell. Hence, in Rel-10, a base station configures a PRACH channel forthe terminal equipment only in the primary serving cell (PCell), and theterminal equipment transmits PRACH signals only in the PCell. And at thesame time, when the terminal equipment needs to transmit PRACH signalsin the PCell, the terminal equipment does not transmit other uplinksignals, including a PUSCH, a PUCCH and an SRS, in the PCell or othersecondary serving cells (SCells).

In the implementation of the present invention, the inventors found thatin Rel-11, as an uplink needs to support aggregation of carriers fromdifferent stations and an inter-band carrier aggregation technology, itcannot be ensured that all the SCells have uplink signal time advancevalue same as that of a PCell. In order to obtain time advance value insome SCells, the terminal equipment needs to perform random access inthe SCells. Therefore, in Rel-11, the base station needs to configurePRACH channel in some SCells for the terminal equipment. And theterminal equipment also needs to transmit PRACH signals in the SCells.At this moment, besides the case occurring in Rel-10 where the terminalequipment needs to transmit multiple PUSCHs in the same subframe at thesame time or the terminal equipment needs to transmit PUSCHs and PUCCHsin the same subframe at the same time, the terminal equipment may needto transmit PUSCHs and PRACHs at the same time, transmit PUCCHs andPRACHs at the same time, and transmit SRSs and PRACHs at the same time.Therefore, the occurrence of the following three scenarios will alsolead to occurrence of a case where the sum of the transmission power ofthe terminal equipment is greater than the configured maximum outputpower of the terminal equipment:

scenario 1 (as shown in FIG. 2): the sum of the transmission power ofthe terminal equipment in transmitting PUXCHs (PUXCH refers to a PUSCHor a PUCCH) and PRACHs respectively in a PCell and a SCell at the sametime is greater than the configured maximum output power of the terminalequipment;

scenario 2 (as shown in FIG. 3): the sum of the transmission power ofthe terminal equipment in transmitting SRSs and PRACHs respectively atthe same time in a PCell and a SCell is greater than the configuredmaximum output power of the terminal equipment; and

scenario 3 (as shown in FIG. 4): both of the sum of the transmissionpower of the terminal equipment in transmitting PUXCHs and PRACHs andthe sum of the transmission power of the terminal equipment intransmitting SRSs and PRACHs respectively in a PCell and a SCell at thesame time are greater than the configured maximum output power of theterminal equipment.

It can be seen that when the sum of the transmission power of theterminal equipment in transmitting PUSCHs and PRACHs in the samesubframe at the same time is greater than the configured maximum outputpower of the terminal equipment, or the sum of the transmission power ofthe terminal equipment in transmitting PUCCHs and PRACHs in the samesubframe at the same time is greater than the configured maximum outputpower of the terminal equipment, or the sum of the transmission power ofthe terminal equipment in transmitting SRSs and PRACHs in the same OFDMsymbol at the same time is greater than the configured maximum outputpower of the terminal equipment, how to control the power in uplinktransmission of signals by the terminal equipment is an urgent problemneeding to be solved at the present.

It should be noted that the above description of the background art ismerely provided for clear and complete explanation of the presentinvention and for easy understanding by those skilled in the art. And itshould not be understood that the above technical solution is known tothose skilled in the art as it is described in the background art of thepresent invention.

SUMMARY OF THE INVENTION

An object of the embodiments of the present invention is to provide apower control method and terminal equipment in case of power of aterminal being limited, so as to solve a problem that the sum of thetransmission power of the terminal equipment in transmitting SRSs andPRACHs in the same OFDM symbol at the same time is greater than theconfigured maximum output power of the terminal equipment, or to solve aproblem that the sum of the transmission power of the terminal equipmentin transmitting PRACHs and other physical uplink channel signals in thesame subframe at the same time is greater than the configured maximumoutput power of the terminal equipment.

According to one aspect of the embodiments of the present invention,there is provided a power control method, including: dropping, byterminal equipment, an SRS signal in other serving cell(s) or puncturingsymbols of a PRACH signal in a secondary serving cell within the sameOFDM symbol as the SRS signal in the other serving cell(s), when theterminal equipment needs to transmit the PRACH signal in the secondaryserving cell and transmit the uplink SRS signal in the other servingcell(s) within the same OFDM symbol.

Based on this method, when the terminal equipment needs to transmit thePRACH signal in the secondary serving cell and transmit a physicaluplink channel signal in the other serving cell(s) within the samesubframe, if total transmission power of the terminal equipment isgreater than maximum output power of the terminal equipment, theterminal equipment adjusts transmission power of the PRACH signal and/orthe physical uplink channel signal according to a predefined priorityorder of the PRACH signal and the physical uplink channel signal, untilthe adjusted total transmission power is less than or equal to themaximum output power of the terminal equipment.

According to another aspect of the embodiments of the present invention,there is provided a power control method, including: adjusting, byterminal equipment, transmission power of a PRACH signal and a SRSsignal according to the priority orders of the PRACH signal and the SRSsignal if total transmission power of the terminal equipment is greaterthan maximum output power of the terminal equipment, when the terminalequipment needs to transmit the PRACH signal in a secondary serving celland transmit the uplink SRS signal in other serving cell(s) within thesame OFDM symbol.

Based on this method, when the terminal equipment needs to transmit thePRACH signal in the secondary serving cell and transmit a physicaluplink channel signal in the other serving cell(s) within the samesubframe, if the total transmission power of the terminal equipment isgreater than the maximum output power of the terminal equipment, theterminal equipment adjusts the transmission power of the PRACH signal oradjusts the transmission power of the PRACH signal and the physicaluplink channel signal, according to a predefined priority order of thePRACH signal and the physical uplink channel signal, until the adjustedtotal transmission power is less than or equal to the maximum outputpower of the terminal equipment.

According to still another aspect of the embodiments of the presentinvention, there is provided terminal equipment, including:

a first determining unit configured to determine whether the terminalequipment needs to transmit a PRACH signal in a secondary serving celland transmit an uplink SRS signal in other serving cell(s) within thesame OFDM symbol; and

a first processing unit configured to drop the SRS signal in the otherserving cell(s) or puncture symbols of the PRACH signal in the secondaryserving cell within the same OFDM symbol as the SRS signal in the otherserving cell(s) if the determination result of the first determiningunit is positive.

Based on the terminal equipment, the terminal equipment furtherincludes:

a second determining unit configured to determine whether the terminalequipment needs to transmit a PRACH signal in a secondary serving celland transmit a physical uplink channel signal in other serving cell(s)within the same subframe; and

a second processing unit configured to adjust transmission power of thePRACH signal and/or the physical uplink channel signal according to apredefined priority order of the PRACH signal and the physical uplinkchannel signal when total transmission power is greater than maximumoutput power when it is determined positive by the second determiningunit, until the adjusted total transmission power is less than or equalto the maximum output power of the terminal equipment.

According to still another aspect of the embodiments of the presentinvention, there is provided terminal equipment, including:

a first determining unit configured to determine whether the terminalequipment needs to transmit a PRACH signal in a secondary serving celland transmit an uplink SRS signal in other serving cell(s) within thesame OFDM symbol;

a first judging unit configured to judge whether total transmissionpower is greater than maximum output power of the terminal equipmentwhen it is determined positive by the first determining unit; and

a first processing unit configured to adjust the transmission power ofthe PRACH signal and the SRS signal according to the priority orders ofthe PRACH signal and the SRS signal when the result of judgment of thefirst judging unit is positive.

Based on the terminal equipment, the terminal equipment furtherincludes:

a second determining unit configured to determine whether the terminalequipment needs to transmit a PRACH signal in a secondary serving celland transmit a physical uplink channel signal in other serving cell(s)within the same subframe;

a second judging unit configured to judge whether the total transmissionpower is greater than the maximum output power of the terminal equipmentwhen it is determined positive by the second determining unit; and

a second processing unit configured to adjust the transmission power ofthe PRACH signal or adjust the transmission power of the PRACH signaland the physical uplink channel signal according to predefined priorityorders of the PRACH signal and the physical uplink channel signal whenit is determined positive by the second judging unit, until the adjustedtotal transmission power is less than or equal to the maximum outputpower of the terminal equipment.

The advantages of the embodiments of the present invention reside inthat the problem that the total transmission power is greater than theconfigured maximum output power resulted from a scenario newly occurredin Rel-11 such as the terminal equipment transmits PRACHs and SRSs inthe same OFMD symbol at the same time is solved, and at the same time,the problem that the total transmission power is greater than theconfigured maximum output power resulted from transmitting PRACHs andphysical uplink channel signals by the terminal equipment in the samesubframe at the same time is solved.

With reference to the following description and drawings, the particularembodiments of the present invention are disclosed in detail, and theprinciple of the present invention and the manners of use are indicated.It should be understood that the scope of the embodiments of the presentinvention is not limited thereto. The embodiments of the presentinvention contain many alternations, modifications and equivalentswithin the spirits and scope of the terms of the appended claims.

Features that are described and/or illustrated with respect to oneembodiment may be used in the same way or in a similar way in one ormore other embodiments and/or in combination with or instead of thefeatures of the other embodiments.

It should be emphasized that the term “comprises/comprising” when usedin this specification is taken to specify the presence of statedfeatures, integers, steps or components but does not preclude thepresence or addition of one or more other features, integers, steps,components or groups thereof.

BRIEF DESCRIPTION OF THE DRAWINGS

Many aspects of the invention can be better understood with reference tothe following drawings. The components in the drawings are notnecessarily to scale, emphasis instead being placed upon clearlyillustrating the principles of the present invention. To facilitateillustrating and describing some parts of the invention, correspondingportions of the drawings may be exaggerated or reduced in size, e.g.,made larger in relation to other parts than in an exemplary deviceactually made according to the invention. Elements and features depictedin one drawing or embodiment of the invention may be combined withelements and features depicted in one or more additional drawings orembodiments. Moreover, in the drawings, like reference numeralsdesignate corresponding parts throughout the several views and may beused to designate like or similar parts in more than one embodiment. Inthe drawings:

FIG. 1A is a schematic diagram of transmitting multiple PUSCHs byterminal equipment in different cells within the same subframe at thesame time in Rel-10 of an LTE-A system;

FIG. 1B is a schematic diagram of transmitting PUSCHs and PUCCHs byterminal equipment in different cells within the same subframe at thesame time in Rel-10 of an LTE-A system;

FIG. 1C is a schematic diagram of transmitting PUSCHs and PUCCHs byterminal equipment in a PCell within the same subframe at the same timein Rel-10 of an LTE-A system;

FIGS. 2A, 2B & 2C are schematic diagrams of transmitting PUXCHs andPRACHs by terminal equipment respectively in different cells at the sametime in Rel-11 of an LTE-A system;

FIGS. 3A & 3B are schematic diagrams of transmitting SRSs and PRACHs byterminal equipment respectively in different cells at the same time inRel-11 of an LTE-A system;

FIGS. 4A & 4B are schematic diagrams of transmitting PUXCHs, SRSs andPRACHs by terminal equipment in different cells at the same time inRel-11 of an LTE-A system;

FIG. 5 is a flowchart of a power control method provided by anembodiment of the present invention;

FIG. 6 is a flowchart of a power control method based on the embodimentof FIG. 5 and provided by another embodiment of the present invention;

FIGS. 7A, 7B & 7C are flowcharts of step 602 in the embodiment of FIG.6;

FIG. 8 is a flowchart of a power control method provided by stillanother embodiment of the present invention;

FIG. 9 is a flowchart of a power control method based on the embodimentof FIG. 8 and provided by further still another embodiment of thepresent invention;

FIGS. 10A, 10B & 10C are flowcharts of step 902 in the embodiment ofFIG. 9;

FIG. 11 is a schematic diagram of the structure of terminal equipmentprovided by an embodiment of the present invention; and

FIG. 12 is a schematic diagram of the structure of terminal equipmentprovided by another embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Foregoing and other features of the embodiments of the present inventionwill become apparent with reference to the drawings and the followingdescription. These embodiments are illustrative only and are notintended to limit the present invention.

An embodiment of the present invention provides a power control methodfor terminal equipment, as described in Embodiment 1 below.

Embodiment 1

FIG. 5 is a flowchart of the power control method provided by anembodiment of the present invention. Referring to FIG. 5, the methodincludes:

step 501: determining whether terminal equipment needs to transmit aPRACH signal in a secondary serving cell and transmit an SRS signal inother serving cell(s) within the same OFDM symbol;

wherein, the other serving cell(s) may be PCells or other SCells thansaid secondary serving cell;

wherein, the SRS signal may be a periodic SRS signal, and may also be anaperiodic SRS signal;

step 502: transmitting only the PRACH signal or only the SRS signal bythe terminal equipment within the OFDM symbol when it is determined thatthe terminal equipment needs to transmit a PRACH signal in an SCell andtransmit an SRS signal in other serving cell(s) within the same OFDMsymbol;

wherein, if the terminal equipment transmits only the PRACH signalwithin the OFDM symbol, the terminal equipment may drop an SRS signal inthe other serving cell(s), that is, transmitting only the PRACH signalwhen a PRACH signal and SRS signals in different serving cells need tobe transmitted within the same OFDM symbol at the same time is ensured;

wherein, if the terminal equipment transmits only the SRS signal withinthe OFDM symbol, the terminal equipment punctures symbols of the PRACHsignal in the SCell in the same OFDM symbol as that of the SRS signal inthe other serving cell(s), that is, transmitting only the SRS signalwhen a PRACH signal and an SRS signal in different serving cells need tobe transmitted within the same OFDM symbol at the same time.

With the above method, when it needs to transmit PRACH signals and SRSsignals in different serving cells within the same OFDM symbol at thesame time, transmitting only the SRS signals or transmitting only thePRACH signals is selected, thereby lowering the transmission power ofthe terminal equipment, and solving the problem that the sum of thetransmission power of the terminal equipment is greater than theconfigured maximum output power of the terminal equipment that may beresulted from transmitting SRS signals and PRACH signals in the sameOFDM symbol at the same time.

An embodiment of the present invention further provides a power controlmethod for terminal equipment, as described in Embodiment 2 below. Thismethod is a power control process of the terminal equipment on the basisof the method of Embodiment 1 when it is determined that the terminalequipment needs to transmit PRACH signals in an SCell and transmitphysical uplink channels signals in other serving cell(s) within thesame subframe. Wherein, contents identical to those in Embodiment 1 areomitted herein.

Embodiment 2

FIG. 6 is a flowchart of the power control method provided by anembodiment of the present invention. As shown in FIG. 6, the methodincludes:

step 601: transmitting only a PRACH signal or only an SRS signal byterminal equipment within an OFDM symbol when the terminal equipmentneeds to transmit the PRACH signal in an SCell and transmit the SRSsignal in other serving cell(s) within the same OFDM symbol;

wherein, the processing in step 601 is identical to the processing inthe method of Embodiment 1 and is omitted herein;

step 602: adjusting, by the terminal equipment, transmission power of aPRACH signal and/or a physical uplink channel signal according to apredefined priority order of the PRACH signal and the physical uplinkchannel signal if total transmission power of the terminal equipment(i.e. the sum of the transmission power for transmitting the PRACH andthe transmission power for transmitting the physical uplink channelsignal) obtained through calculation is greater than maximum outputpower of the terminal equipment, when the terminal equipment needs totransmit the PRACH signal in an SCell and transmit the physical uplinkchannel signal in other serving cell(s) within the same subframe, untilthe adjusted total transmission power is less than or equal to themaximum output power of the terminal equipment;

wherein, the physical uplink channel signal transmitted in the otherserving cell(s) may be any combination of the following signals: a PUCCHsignal, a PUSCH signal with UCI, and a PUSCH with no UCI; and wherein,the other serving cell(s) are different according to the types of thephysical uplink channel signals; for example, for a PUSCH signal, theother serving cell(s) here may be PCell, and may also be other SCell(s)than said SCell; and for a PUCCH signal, the other serving cell(s) heremay be PCell;

wherein, as the types of the physical uplink channel signals transmittedin the other serving cell(s) are different, when it is determined inthis embodiment that the total transmission power of the terminalequipment in transmitting the PRACH signal and the physical uplinkchannel signal is greater than the maximum output power of the terminalequipment, the terminal equipment adjusts the transmission power of thePRACH signal or the physical uplink channel signal according to apredefined priority order of the PRACH signal and the physical uplinkchannel signal, until the adjusted total transmission power is less thanor equal to the maximum output power of the terminal equipment; andwherein, the priority order of each signal may be predefined, which isdefined in this embodiment as: the priority order of the PUSCH signalwith no UCI is less than or equal to that of the PRACH signal, thepriority order of the PRACH signal is less than that of the PUSCH signalwith UCI, and the priority order of the PUSCH signal with UCI is lessthan that of the PUCCH signal.

In this embodiment, as a signal of relatively lower priority order isrelatively less important to the terminal equipment, the transmissionpower of the signal of relatively lower priority order is lowered inthis embodiment in accordance with this rule, so as to ensure thetransmission of a signal of relatively higher priority order. In thefollowing description, the remaining transmission power refers to themaximum output power of the terminal equipment subtracted by theallocated transmission power.

In an implementation, step 602 may be carried out by the method shown inFIGS. 7a-7c , and will be described below in detail with reference toFIGS. 7a -7 c.

Referring to FIGS. 7a-7c , the method includes:

step 701: obtaining total transmission power by the terminal equipmentby calculating the transmission power of the signals to be transmitted;

step 702: judging by the terminal equipment whether the totaltransmission power is greater than the maximum output power of theterminal equipment; and executing step 703 if yes; otherwise,terminating the process;

step 703: judging a type of physical uplink channel signals to betransmitted by the terminal equipment; executing step 704 if there isonly one type, executing step 707 if there are two types, and executingstep 713 if there are three types;

refer to FIG. 7a for the case where there is only one type of physicaluplink channel signals to be transmitted at the same time;

step 704: judging by the terminal equipment whether the priority orderof the PRACH signal is identical to that of the physical uplink channelsignal to be transmitted; and executing step 705 if yes; otherwise,executing step 706;

step 705: lowering the transmission power of the PRACH signal and thephysical uplink channel signal by the terminal equipment by an equalshare, until the adjusted total transmission power is less than or equalto the maximum output power of the terminal equipment;

step 706: satisfying the transmission power of a signal of higherpriority order and lowering the transmission power of a signal of lowerpriority order by the terminal equipment, until the adjusted totaltransmission power is less than or equal to the maximum output power ofthe terminal equipment;

refer to FIG. 7b for the case where there are two types of physicaluplink channel signals to be transmitted at the same time;

step 707: satisfying the transmission power of a signal of highestpriority order by the terminal equipment;

step 708: judging by the terminal equipment whether the priority ordersof the remaining two signals are identical; and executing step 709 ifyes; otherwise, executing step 710;

step 709: lowering the transmission power of the remaining two signals(i.e. the PRACH signal and the physical uplink channel signal) by theterminal equipment by an equal share, until the adjusted totaltransmission power is less than or equal to the maximum output power ofthe terminal equipment;

step 710: judging by the terminal equipment whether the remainingtransmission power satisfies a signal of secondary priority order; andexecuting step 711 if yes; otherwise, executing step 712;

step 711: satisfying the transmission power of a signal of secondarypriority order and lowering the transmission power of a signal of lowestpriority order by the terminal equipment, until the adjusted totaltransmission power is less than or equal to the maximum output power ofthe terminal equipment;

step 712: setting the transmission power of the signal of lowestpriority order to be 0 and allocating the remaining transmission powerto the signal of secondary priority order by the terminal equipment;

refer to FIG. 7c for the case where there are three types of physicaluplink channel signals to be transmitted at the same time;

step 713: satisfying the transmission power of the signal of highestpriority order by the terminal equipment;

step 714: judging by the terminal equipment whether the remainingtransmission power satisfies a signal of secondary priority order; andexecuting step 716 if yes; otherwise, executing step 715;

step 715: allocating the remaining transmission power to the signal ofsecondary priority order and setting the transmission power of theremaining signals to be 0 by the terminal equipment;

step 716: satisfying the transmission power of the signal of secondarypriority order by the terminal equipment;

step 717: judging by the terminal equipment whether the priority ordersof the remaining two signals are identical; and executing step 718 ifyes; otherwise, executing step 719;

step 718: lowering the transmission power of the remaining two signalsby the terminal equipment by an equal share, until the adjusted totaltransmission power is less than or equal to the maximum output power ofthe terminal equipment;

step 719: judging by the terminal equipment whether the remainingtransmission power satisfies a signal of relatively higher priorityorder in the remaining two signals; and executing step 720 if yes;otherwise, executing step 721;

step 720: satisfying the transmission power of the signal of relativelyhigher priority order in the remaining two signals and lowering thetransmission power of the signal of lowest priority order by theterminal equipment, until the adjusted total transmission power is lessthan or equal to the maximum output power of the terminal equipment; and

step 721: allocating the remaining transmission power to the signal ofrelatively higher priority order in the remaining two signals andsetting the transmission power of the signal of lowest priority order tobe 0 by the terminal equipment.

In this embodiment, as the types and priority orders of the physicaluplink channel signals needing to be transmitted in the other servingcell(s) are different, the signals needing to be adjusted with respectto transmission power are also different. For the method of FIG. 7a-FIG. 7c to be more clear, following description is given for differentcases.

For the case where there is only one type of physical uplink channelsignals.

If the physical uplink channel signals are PUSCH signals with no UCI,that is, when the terminal equipment needs to transmit PRACH signals inan SCell and transmit PUSCH signals with no UCI in a PCell or otherSCell(s) within the same subframe, the terminal equipment firstcalculates the transmission power needed by each PUSCH and thetransmission power needed by the PRACHs according to above formulae (5)and (4) respectively. If the total transmission power thus obtainedexceeds the maximum output power of the terminal equipment, according towhat is predefined in this embodiment that the priority order of a PUSCHsignal with no UCI is less than or equal to the priority order of aPRACH signal, the adjusting policy determined by the terminal equipmentaccording to the predefined priority order is as follows: if thepriority order of a PUSCH signal with no UCI is equal to the priorityorder of a PRACH signal, the terminal equipment lowers the transmissionpower of the PRACHs and all the PUSCHs with no UCI by an equal share,until that the total transmission power is less than or equal to themaximum output power of the terminal equipment is ensured; and if thepriority order of a PUSCH signal with no UCI is less than the priorityorder of a PRACH signal, the terminal equipment first satisfies thetransmission power of the PRACHs, that is, allocating the transmissionpower needed by the PRACHs to the PRACHs, and then lowers thetransmission power of each PUSCH with no UCI by an equal share, untilthat the total transmission power is less than or equal to the maximumoutput power of the terminal equipment is ensured.

If the physical uplink channel signals are PUSCH signals with UCI, thatis, when the terminal equipment needs to transmit PRACH signals in anSCell and transmit PUSCH signals with UCI in a PCell or other SCell(s)within the same subframe, the terminal equipment first calculates thetransmission power needed by the PUSCHs and the transmission powerneeded by the PRACHs according to above formulae (5) and (4)respectively. If the total transmission power thus obtained exceeds themaximum output power of the terminal equipment, according to what ispredefined in this embodiment that the priority order of a PRACH signalis less than the priority order of a PUSCH signal with UCI, the terminalequipment first ensures satisfying the transmission power of the PUSCHswith UCI, that is, allocating the transmission power needed by thePUSCHs with UCI to the PUSCHs with UCI, and then lowers the transmissionpower of the PRACHs, until that the total transmission power is lessthan or equal to the maximum output power of the terminal equipment isensured.

If the physical uplink channel signals are PUCCH signals, that is, whenthe terminal equipment needs to transmit PRACH signals in an SCell andtransmit PUCCH signals in a PCell within the same subframe, the terminalequipment first calculates the transmission power needed by the PUCCHsand the transmission power needed by the PRACHs according to aboveformulae (7) and (4) respectively. If the total transmission power thusobtained exceeds the maximum output power of the terminal equipment,according to what is predefined in this embodiment that the priorityorder of a PRACH signal is less than the priority order of a PUCCHsignal, the terminal equipment first ensures satisfying the transmissionpower of the PUCCHs, that is, allocating the transmission power neededby the PUCCHs to the PUCCHs, and then lowers the transmission power ofthe PRACHs, until that the total transmission power is less than orequal to the maximum output power of the terminal equipment is ensured.

For the case where there are two types of physical uplink channelsignals.

If the physical uplink channel signals are PUSCH signals with no UCI andPUSCH signals with UCI, that is, when the terminal equipment needs totransmit PRACH signals in an SCell and transmit PUSCH signals with noUCI and PUSCH signals with UCI in a PCell or other SCell(s) within thesame subframe, the terminal equipment first calculates the transmissionpower needed by the PUSCHs and the transmission power needed by thePRACHs according to above formulae (5) and (4) respectively. If thetotal transmission power thus obtained exceeds the maximum output powerof the terminal equipment, according to what is predefined in thisembodiment that the priority order of a PUSCH signal with no UCI is lessthan or equal to the priority order of a PRACH signal and the priorityorder of a PRACH signal is less than the priority order of a PUSCHsignal with UCI, the terminal equipment first ensures satisfying thetransmission power of the PUSCHs with UCI, that is, allocating thetransmission power needed by the PUSCHs with UCI to the PUSCHs with UCI,and processes the remaining transmission power in different ways, as thepriority order of a PUSCH signal with no UCI is less than or equal tothe priority order of a PRACH signal, which are transmitted at the sametime. For the case where the priority order of a PUSCH signal with noUCI is less than the priority order of a PRACH signal, the terminalequipment judges whether the remaining transmission power satisfies thetransmission power needed by the PRACH signals; if yes, the terminalequipment satisfies the transmission power of the PRACH signals, andthen lowers the transmission power of all the PUSCHs with no UCI by anequal share, until that the total transmission power is less than orequal to the maximum output power of the terminal equipment is ensured;and if no, the terminal equipment sets the transmission power of thePUSCH signals with no UCI to be 0, and allocates the remainingtransmission power to the PRACH signals. For the case where the priorityorder of a PUSCH signal with no UCI is equal to the priority order of aPRACH signal, the terminal equipment lowers the transmission power ofthe PRACHs and all the PUSCHs with no UCI by an equal share, until thatthe total transmission power is less than or equal to the maximum outputpower of the terminal equipment is ensured.

If the physical uplink channel signals are PUSCH signals with no UCI andPUCCH signals, that is, when the terminal equipment needs to transmitPRACH signals in an SCell and transmit PUSCH signals with no UCI in aPCell or other SCell(s) and transmit PUCCH signals in a PCell within thesame subframe, the terminal equipment first calculates the transmissionpower needed by the PUCCHs, the transmission power needed by the PUSCHsand the transmission power needed by the PRACHs according to aboveformulae (4), (5) and (7), or (4), (6) and (7), respectively. If thetotal transmission power thus obtained exceeds the maximum output powerof the terminal equipment, according to what is predefined in thisembodiment that the priority order of a PUSCH signal with no UCI is lessthan or equal to the priority order of a PRACH signal and the priorityorder of a PRACH signal is less than the priority order of a PUCCHsignal, the terminal equipment first ensures satisfying the transmissionpower of the PUCCH signals, that is, allocating the transmission powerneeded by the PUCCHs to the PUCCHs, and processes the remainingtransmission power in different ways, as the priority order of a PUSCHsignal with no UCI is less than or equal to the priority order of aPRACH signal, which are transmitted at the same time. For the case wherethe priority order of a PUSCH signal with no UCI is less than thepriority order of a PRACH signal, the terminal equipment judges whetherthe remaining transmission power satisfies the transmission power neededby the PRACH signals; if yes, the terminal equipment satisfies thetransmission power of the PRACH signals, and then lowers thetransmission power of all the PUSCH signals with no UCI by an equalshare, until that the total transmission power is less than or equal tothe maximum output power of the terminal equipment is ensured; and ifno, the terminal equipment sets the transmission power of the PUSCHsignals with no UCI to be 0, and allocates the remaining transmissionpower to the PRACH signals. For the case where the priority order of aPUSCH signal with no UCI is equal to the priority order of a PRACHsignal, the terminal equipment lowers the transmission power of thePRACHs and all the PUSCHs with no UCI by an equal share, until that thetotal transmission power is less than or equal to the maximum outputpower of the terminal equipment is ensured.

If the physical uplink channel signals are PUSCH signals with UCI andPUCCH signals, that is, when the terminal equipment needs to transmitPRACH signals in an SCell and transmit PUSCH signals with UCI in a PCellor other SCell(s) and transmit PUCCH signals in a PCell within the samesubframe, the terminal equipment first calculates the transmission powerneeded by the PUCCHs and the transmission power needed by the PUSCHs andthe transmission power needed by the PRACHs according to above formulae(4), (5) and (7), or (4), (5) and (6), respectively. If the totaltransmission power thus obtained exceeds the maximum output power of theterminal equipment, according to what is predefined in this embodimentthat the priority order of a PRACH signal is less than the priorityorder of a PUSCH signal with UCI and the priority order of a PUSCHsignal with UCI is less than the priority order of a PUCCH signal, theterminal equipment first ensures satisfying the transmission power ofthe PUCCHs, that is, allocating the transmission power needed by thePUCCHs to the PUCCHs. For the remaining transmission power, the terminalequipment judges whether the remaining transmission power satisfies thetransmission power of the PUSCH signals with UCI; if yes, the terminalequipment satisfies the transmission power of the PUSCH signals withUCI, and then allocates the remaining transmission power to the PRACHs;and if no, the terminal equipment sets the transmission power of thePRACHs to be 0, and allocates the remaining transmission power to thePUSCH signals with UCI.

For the case where there are three types of physical uplink channelsignals.

If the physical uplink channel signals are PUSCH signals with no UCI,PUSCH signals with UCI and PUCCH signals, that is, when the terminalequipment needs to transmit PRACH signals in an SCell, transmit PUSCHsignals with UCI and PUSCH signals with no UCI in a PCell or otherSCell(s) and transmit PUCCH signals in a PCell within the same subframe,the terminal equipment first calculates the transmission power needed bythe PUCCHs, the transmission power needed by the PUSCHs and thetransmission power needed by the PRACHs according to above formulae (4),(5) and (7), or (4), (5) and (6), respectively. If the totaltransmission power thus obtained exceeds the maximum output power of theterminal equipment, according to what is predefined in this embodimentthat the priority order of a PUSCH signal with no UCI is less than orequal to the priority order of a PRACH signal, the priority order of aPRACH signal is less than the priority order of a PUSCH signal with UCIand the priority order of a PUSCH signal with UCI is less than thepriority order of a PUCCH signal, the terminal equipment first ensuressatisfying the transmission power of the PUCCHs, that is, allocating thetransmission power needed by the PUCCHs to the PUCCHs. For the remainingtransmission power, the terminal equipment judges whether the remainingtransmission power satisfies the transmission power of the PUSCH signalswith UCI; if the transmission power of the PUSCH signals with UCI can besatisfied, the terminal equipment satisfies the transmission power ofthe PUSCH signals with UCI. And the terminal equipment processes theremaining transmission power in different ways, as the priority order ofa PUSCH signal with no UCI is less than or equal to the priority orderof a PRACH signal, which are transmitted at the same time. For the casewhere the priority order of a PUSCH signal with no UCI is less than thepriority order of a PRACH signal, the terminal equipment judges whetherthe remaining transmission power satisfies the transmission power neededby the PRACH signals; if yes, the terminal equipment satisfies thetransmission power of the PRACH signals, and then lowers thetransmission power of all the PUSCH signals with no UCI by an equalshare, until that the total transmission power is less than or equal tothe maximum output power of the terminal equipment is ensured; and ifno, the terminal equipment sets the transmission power of the PUSCHsignals with no UCI to be 0, and allocates the remaining transmissionpower to the PRACH signals. For the case where the priority order of aPUSCH signal with no UCI is equal to the priority order of a PRACHsignal, the terminal equipment lowers the transmission power of thePRACHs and all the PUSCHs with no UCI by an equal share, until that thetotal transmission power is less than or equal to the maximum outputpower of the terminal equipment is ensured. And if the transmissionpower of the PUSCH signals with UCI cannot be satisfied, the terminalequipment sets the transmission power of the PRACHs and all the PUSCHswith no UCI to be 0, and allocates the remaining transmission power tothe PUSCH signals with UCI at the same time.

With the power control method of this embodiment, when the terminalequipment needs to transmit PRACH signals and SRS signals in differentserving cells within the same OFDM symbol at the same time, thetransmission power of the terminal equipment is lowered by dropping theSRS signals and transmitting only the PRACH signals, or by puncturingthe PRACH signals in the same OFDM symbol as the SRS signals andtransmitting only the SRS signals, and the problem that the totaltransmission power is greater than the configured maximum output powerresulted from transmitting SRS signals and PRACH signals by the terminalequipment in the same OFDM symbol at the same time is solved.Furthermore, when the terminal equipment needs to transmit PRACH signalsin an SCell and transmit physical uplink channel signals in othercell(s) within the same subframe, if the transmission power of theterminal equipment is greater than the maximum output power of theterminal equipment, the terminal equipment may determine a power controlpolicy according to the priority orders of the PRACH signals and eachphysical uplink channel signal, so as to ensure that the totaltransmission power is less than or equal to the maximum output power ofthe terminal equipment, thereby providing a practical and feasible powercontrol method for a scenario newly occurred in Rel-11 in which thepower of the terminal equipment is limited.

An embodiment of the present invention further provides a power controlmethod, as described in Embodiment 3 below. Different from those inembodiments 1 and 2, in the method in Embodiment 3, in case that PRACHsignals and SRS signals are transmitted in the same OFDM symbol at thesame time, not one type of the signals are transmitted, but the twotypes of the signals are transmitted at the same time with thetransmission power of one type of the signals of relatively lowerpriority order to be controlled according to a priority order policy,which shall be described below in detail.

Embodiment 3

FIG. 8 is a flowchart of the power control method provided by anembodiment of the present invention. Referring to FIG. 8, the methodincludes:

step 801: determining whether terminal equipment needs to transmit aPRACH signal in an SCell and transmit an SRS signal in other servingcell(s) within the same OFDM symbol;

wherein, the other serving cell(s) may be PCell or other SCell(s) thansaid SCell;

wherein, the SRS signal may be a periodic SRS signal, and may also be anaperiodic SRS signal;

step 802: adjusting transmission power of the PRACH signal and the SRSsignal by the terminal equipment according to a predefined priorityorder of the PRACH signal and the SRS signal if total transmission powerof the terminal equipment (i.e. the sum of the transmission power fortransmitting PRACH signals and the transmission power for transmittingSRS signals) obtained through calculation is greater than maximum outputpower of the terminal equipment when it is determined that the terminalequipment needs to transmit the PRACH signal in the SCell and transmitthe SRS signal in other serving cell(s) within the same OFDM symbol;

wherein, if the priority order of the PRACH signal predefined in thisembodiment is less than that of the SRS signal, the terminal equipmentfirst judges whether the maximum output power of the terminal equipmentsatisfies the transmission power for transmitting SRS; if yes, theterminal equipment satisfies the transmission power for transmittingSRS, and then allocates the remaining transmission power to the PRACH;and if no, the terminal equipment sets the transmission power of thePRACH to be 0, and allocates the transmission power (the maximum outputpower) to all the SRS signals by an equal share.

With the above method, when it needs to transmit PRACH signals and SRSsignals in different serving cells within the same OFDM symbol at thesame time, the terminal equipment ensures the transmission of thesignals of higher priory order, such as the transmission of the SRSsignals, by controlling the transmission power of the signals, therebysolving the problem that the sum of the transmission power is greaterthan the maximum output power that may be resulted from transmitting SRSsignals and PRACH signals by the terminal equipment in the same OFDMsymbol at the same time.

An embodiment of the present invention further provides a power controlmethod for terminal equipment, as described in Embodiment 4 below. Thismethod is a power control process of the terminal equipment on the basisof the method of Embodiment 3 when it is determined that the terminalequipment needs to transmit PRACH signals in an SCell and transmitphysical uplink channels signals in other serving cell(s) within thesame subframe. Wherein, contents identical to those in Embodiment 3 areomitted herein.

Embodiment 4

FIG. 9 is a flowchart of the power control method provided by anembodiment of the present invention. Referring to FIG. 9, the methodincludes:

step 901: adjusting transmission power of a signal of relatively lowerpriority order by terminal equipment according to a predefined priorityorder of a PRACH signal and an SRS signal if total transmission power ofthe terminal equipment (i.e. the sum of the transmission power fortransmitting PRACH signals and the transmission power for transmittingSRS signals) obtained through calculation is greater than maximum outputpower of the terminal equipment when the terminal equipment needs totransmit the PRACH signal in the SCell and transmit the uplink SRSsignal in other serving cell(s) within the same OFDM symbol;

wherein, the processing in step 901 is identical to the processing inthe method of Embodiment 3 and is omitted herein;

step 902: adjusting, by the terminal equipment, transmission power ofthe signal of relatively lower priority order according to a predefinedpriority order of a PRACH signal and a physical uplink channel signal ifthe total transmission power of the terminal equipment (i.e. the sum ofthe transmission power for transmitting the PRACH and the transmissionpower for transmitting the physical uplink channel signal) obtainedthrough calculation is greater than the maximum output power of theterminal equipment, when the terminal equipment needs to transmit thePRACH signal in the SCell and transmit the physical uplink channelsignal in other serving cell(s) within the same subframe, until theadjusted total transmission power is less than or equal to the maximumoutput power of the terminal equipment;

wherein, the physical uplink channel signal transmitted in the otherserving cell(s) may be any combination of the following signals: a PUCCHsignal, a PUSCH signal with UCI, and a PUSCH signal with no UCI; andwherein, the other serving cell(s) are different according to the typesof the physical uplink channel signals; for example, for a PUSCH signal,the other serving cell(s) here may be a PCell, and may also be otherSCell(s) than said SCell; and for a PUCCH signal, the other servingcell(s) here may be a PCell;

wherein, as the types of the physical uplink channel signals transmittedin the other serving cell(s) are different, when it is determined inthis embodiment that the total transmission power of the terminalequipment in transmitting the PRACH signal and the physical uplinkchannel signal is greater than the maximum output power of the terminalequipment, the terminal equipment adjusts the transmission power of thesignal of relatively lower priority order according to priority ordersof the PRACH signal and the physical uplink channel signal, until theadjusted total transmission power is less than or equal to the maximumoutput power of the terminal equipment; and wherein, the priority orderof each signal may be predefined, which is defined in this embodimentas: the priority order of the PRACH signal is less than that of thePUSCH signal with no UCI, the priority order of the PUSCH signal with noUCI is less than that of the PUSCH signal with UCI, and the priorityorder of PUSCH signal with UCI is less than that of the PUCCH signal.

In this embodiment, as a signal of relatively lower priority order isrelatively less important to the terminal equipment, the transmissionpower of the signal of relatively lower priority order is lowered inthis embodiment in accordance with this rule, so as to ensure thetransmission of a signal of relatively higher priority order. In thefollowing description, the remaining transmission power refers to themaximum output power of the terminal equipment subtracted by theallocated transmission power.

In this embodiment, as PRACHs and SRSs are transmitted in the same OFDMsymbol, when PRACHs and physical uplink channel signals are transmittedin the same subframe, the processing of step 902 in Embodiment 4 isslightly different from that of step 602 in Embodiment 2. In which, step902 may be carried out by the method shown in FIGS. 10a-10c , and willbe described below in detail with reference to FIGS. 10a -10 c.

Referring to FIGS. 10a-10c , the method includes:

step 1001: obtaining total transmission power by the terminal equipmentby calculating the transmission power of the signals to be transmitted;

step 1002: judging by the terminal equipment whether the totaltransmission power is greater than the maximum output power of theterminal equipment; and executing step 1003 if yes; otherwise,terminating the process;

step 1003: judging the number of types of the transmitted physicaluplink channel signals by the terminal equipment; executing step 1004 ifthere is only one type, executing step 1007 if there are two types, andexecuting step 1011 if there are three types;

refer to FIG. 10a for the case where there is only one type of physicaluplink channel signals;

step 1004: judging by the terminal equipment whether the transmissionpower of the signal of higher priority order is satisfied; and executingstep 1005 if yes; otherwise, executing step 1006;

step 1005: satisfying the transmission power of the signal of higherpriority order and allocating the remaining transmission power to thesignal of lower priority order by the terminal equipment;

step 1006: setting the transmission power of the signal of lowerpriority order to be 0 and allocating the remaining transmission powerto the signal of higher priority order by the terminal equipment;

refer to FIG. 10b for the case where there are two types of physicaluplink channel signals;

step 1007: satisfying the transmission power of a signal of highestpriority order by the terminal equipment;

step 1008: judging by the terminal equipment whether the remainingtransmission power satisfies a signal of secondary priority order; andexecuting step 1009 if yes; otherwise, executing step 1010;

step 1009: satisfying the transmission power of the signal of secondarypriority order and allocating the remaining transmission power to thesignal of lowest priority order by the terminal equipment;

step 1010: setting the transmission power of the signal of lowestpriority order to be 0 and allocating the remaining transmission powerto the signal of secondary priority order by the terminal equipment;

refer to FIG. 10c for the case where there are three types of physicaluplink channel signals;

step 1011: satisfying the transmission power of the signal of highestpriority order by the terminal equipment;

step 1012: judging by the terminal equipment whether the remainingtransmission power satisfies a signal of secondary priority order; andexecuting step 1013 if yes; otherwise, executing step 1017;

step 1013: satisfying the transmission power of the signal of secondarypriority order by the terminal equipment;

step 1014: judging by the terminal equipment whether the remainingtransmission power satisfies a signal of a third priority order; andexecuting step 1015 if yes; otherwise, executing step 1016;

step 1015: satisfying the transmission power of the signal of a thirdpriority order and allocating the remaining transmission power to thesignal of lowest priority order;

step 1016: setting the transmission power of the signal of lowestpriority order to be 0 and allocating the remaining transmission powerto the signal of a third priority order by the terminal equipment;

step 1017: allocating the remaining transmission power to the signal ofsecondary priority order and setting the transmission power of theremaining signals to be 0 by the terminal equipment.

In this embodiment, as the types and priority orders of the physicaluplink channel signals needing to be transmitted in the other servingcell(s) are different, the signals needing to be adjusted with respectto transmission power are also different. For the method of FIG. 10a-FIG. 10c to be more clear, following description is given for differentcases.

For the case where there is only one type of physical uplink channelsignals.

If the physical uplink channel signals are PUSCH signals with no UCI,that is, when the terminal equipment needs to transmit PRACH signals inan SCell and transmit PUSCH signals with no UCI in a PCell or otherSCell(s) within the same subframe, the terminal equipment firstcalculates the transmission power needed by each PUSCH and thetransmission power needed by the PRACHs according to above formulae (5)and (4) respectively. If the total transmission power thus obtainedexceeds the maximum output power of the terminal equipment, according towhat is predefined in this embodiment that the priority order of a PRACHsignal is less than the priority order of a PUSCH signal with no UCI,the terminal equipment first judges whether the transmission power ofall the PUSCHs with no UCI is satisfied; if the result of judgment isyes, the terminal equipment satisfies the transmission power of all thePUSCHs with no UCI, and allocates the remaining transmission power tothe PRACHs; and if the result of judgment is no, the terminal equipmentsets the transmission power of the PRACHs to be 0, and allocates theremaining transmission power to each of the PUSCHs with no UCI by anequal share.

If the physical uplink channel signals are PUSCH signals with UCI, thatis, when the terminal equipment needs to transmit PRACH signals in anSCell and transmit PUSCH signals with UCI in a PCell or other SCell(s)within the same subframe, the terminal equipment first calculates thetransmission power needed by the PUSCHs and the transmission powerneeded by the PRACHs according to above formulae (5) and (4)respectively. If the total transmission power thus obtained exceeds themaximum output power of the terminal equipment, according to what ispredefined in this embodiment that the priority order of a PRACH signalis less than the priority order of a PUSCH signal with UCI, the terminalequipment first ensures satisfying the transmission power of the PUSCHswith UCI, and then allocates the remaining transmission power to thePRACHs.

If the physical uplink channel signals are PUCCH signals, that is, whenthe terminal equipment needs to transmit PRACH signals in an SCell andtransmit PUCCH signals in a PCell within the same subframe, the terminalequipment first calculates the transmission power needed by the PUCCHsand the transmission power needed by the PRACHs according to aboveformulae (2) and (4) respectively. If the total transmission power thusobtained exceeds the maximum output power of the terminal equipment,according to what is predefined in this embodiment that the priorityorder of a PRACH signal is less than the priority order of a PUCCHsignal, the terminal equipment first ensures satisfying the transmissionpower of the PUCCHs, and then allocates the remaining transmission powerto the PRACHs.

For the case where there are two types of physical uplink channelsignals.

If the physical uplink channel signals are PUSCH signals with no UCI andPUSCH signals with UCI, that is, when the terminal equipment needs totransmit PRACH signals in an SCell and transmit PUSCH signals with noUCI and PUSCH signals with UCI in a PCell or other SCell(s) within thesame subframe, the terminal equipment first calculates the transmissionpower needed by the PUSCHs and the transmission power needed by thePRACHs according to above formulae (5) and (4) respectively. If thetotal transmission power thus obtained exceeds the maximum output powerof the terminal equipment, according to what is predefined in thisembodiment that the priority order of a PRACH signal is less than thepriority order of a PUSCH signal with no UCI and the priority order of aPUSCH signal with no UCI is less than the priority order of a PUSCHsignal with UCI, the terminal equipment first ensures satisfying thetransmission power of the PUSCH signal with UCI, and then judges whetherthe remaining transmission power satisfies the transmission power of thePUSCH signal with no UCI; if yes, the terminal equipment satisfies thetransmission power of the PUSCH signals with no UCI, and then allocatesthe remaining transmission power to the PRACHs; and if no, the terminalequipment sets the transmission power of the PRACHs to be 0, andallocates the remaining transmission power to all the PUSCHs with no UCIby an equal share.

If the physical uplink channel signals are PUSCH signals with no UCI andPUCCH signals, that is, when the terminal equipment needs to transmitPRACH signals in an SCell and transmit PUSCH signals with no UCI in aPCell or other SCell(s) and transmit PUCCH signals in a PCell within thesame subframe, the terminal equipment first calculates the transmissionpower needed by the PUCCHs, the transmission power needed by the PUSCHsand the transmission power needed by the PRACHs according to aboveformulae (4), (5) and (7), or (4), (5) and (6), respectively. If thetotal transmission power thus obtained exceeds the maximum output powerof the terminal equipment, according to what is predefined in thisembodiment that the priority order of a PRACH signal is less than thepriority order of a PUSCH signal with no UCI and the priority order of aPUSCH signal with no UCI is less than the priority order of a PUCCHsignal, the terminal equipment first ensures satisfying the transmissionpower of the PUCCHs, and then judges whether the remaining transmissionpower satisfies the transmission power of the PUSCH signals with no UCI;if yes, the terminal equipment satisfies the transmission power of thePUSCH signals with no UCI, and then allocates the remaining transmissionpower to the PRACHs; and if no, the terminal equipment sets thetransmission power of the PRACHs to be 0, and allocates the remainingtransmission power to all the PUSCHs with no UCI by an equal share.

If the physical uplink channel signals are PUSCH signals with UCI andPUCCH signals, that is, when the terminal equipment needs to transmitPRACH signals in an SCell and transmit PUSCH signals with UCI in a PCellor other SCell(s) and transmit PUCCH signals in a PCell within the samesubframe, the terminal equipment first calculates the transmission powerneeded by the PUCCHs, the transmission power needed by the PUSCHs andthe transmission power needed by the PRACHs according to above formulae(4), (5) and (7), or (4), (5) and (6), respectively. If the totaltransmission power thus obtained exceeds the maximum output power of theterminal equipment, according to what is predefined in this embodimentthat the priority order of a PRACH signal is less than the priorityorder of a PUSCH signal with UCI and the priority order of a PUSCHsignal with UCI is less than the priority order of a PUCCH signal, theterminal equipment first ensures satisfying the transmission power ofthe PUCCH signals, and then judges whether the remaining transmissionpower satisfies the transmission power of the PUSCH signals with UCI; ifyes, the terminal equipment satisfies the transmission power of thePUSCH signals with UCI, and then allocates the remaining transmissionpower to the PRACHs; and if no, the terminal equipment sets thetransmission power of the PRACHs to be 0, and allocates the remainingtransmission power to the PUSCHs with UCI.

For the case where there are three types of physical uplink channelsignals.

If the physical uplink channel signals are PUSCH signals with no UCI,PUSCH signals with UCI and PUCCH signals, that is, when the terminalequipment needs to transmit PRACH signals in an SCell, transmit PUSCHsignals with UCI and PUSCH signals with no UCI in a PCell or otherSCell(s) and transmit PUCCH signals in a PCell within the same subframe,the terminal equipment first calculates the transmission power needed bythe PUCCHs, the transmission power needed by the PUSCHs and thetransmission power needed by the PRACHs according to above formulae (4),(5) and (7), or (4), (5) and (6), respectively. If the totaltransmission power thus obtained exceeds the maximum output power of theterminal equipment, according to what is predefined in this embodimentthat the priority order of a PRACH signal is less than the priorityorder of a PUSCH signal with no UCI, the priority order of a PUSCHsignal with no UCI is less than the priority order of a PUSCH signalwith UCI and the priority order of a PUSCH signal with UCI is less thanthe priority order of a PUCCH signal, the terminal equipment firstensures satisfying the transmission power of the PUCCHs, and then judgeswhether the remaining transmission power satisfies the transmissionpower of the PUSCH signals with UCI; if the transmission power of thePUSCH signals with UCI cannot be satisfied, the terminal equipment setsthe transmission power of the PRACHs and the transmission power of allthe PUSCHs with no UCI to be 0, and at the same time, allocates theremaining transmission power to the PUSCHs with UCI; if the transmissionpower of the PUSCH signal with UCI can be satisfied, the terminalequipment satisfies the transmission power of the PUSCH signals withUCI, and then judges whether the remaining transmission power satisfiesthe transmission power of the PUSCH signals with no UCI. If thetransmission power of the PUSCH signals with no UCI can be satisfied,the terminal equipment satisfies the transmission power of the PUSCHsignals with no UCI, and then allocates the remaining transmission powerto the PRACHs; and if the transmission power of the PUSCH signals withno UCI cannot be satisfied, the terminal equipment sets the transmissionpower of the PRACHs to be 0, and at the same time, allocates theremaining transmission power to all the PUSCHs with no UCI.

With the power control method of this embodiment, when the terminalequipment needs to transmit PRACH signals and SRS signals in differentserving cells within the same OFDM symbol at the same time, if the totaltransmission power of the terminal equipment obtained throughcalculation is greater than the maximum output power of the terminalequipment, the terminal equipment adjusts the transmission power of asignal of relatively lower priority order, so as to ensure that thetotal transmission power is less than or equal to the maximum outputpower of the terminal equipment, thereby solving the problem that thetotal transmission power is greater than the configured maximum outputpower resulted from transmitting SRS signals and PRACH signals by theterminal equipment within the same OFDM symbol at the same time.Furthermore, when the terminal equipment needs to transmit PRACH signalsin an SCell and transmit physical uplink channel signals in othercell(s) within the same subframe, if the total transmission power of theterminal equipment obtained through calculation is greater than themaximum output power of the terminal equipment, the terminal equipmentmay adjust the transmission power of a signal of relatively lowerpriority order according to the priority order of the PRACH signals andeach physical uplink channel signal, so as to ensure that the totaltransmission power is less than or equal to the maximum output power ofthe terminal equipment, thereby providing a practical and feasible powercontrol method for a scenario newly occurred in Rel-11 in which thepower of the terminal equipment is limited.

An embodiment of the present invention further provides terminalequipment, as described in Embodiment 5 below. As the principle of theterminal equipment for solving problem is similar to that of the methodin embodiments 1 and 2, the implementation of the method may be referredto for the implementation of the terminal equipment, and the repeatedparts shall not be described any further.

Embodiment 5

FIG. 11 is a schematic diagram of the structure of terminal equipmentprovided by an embodiment of the present invention. Referring to FIG.11, the terminal equipment includes:

a first determining unit 111 configured to determine whether theterminal equipment needs to transmit a PRACH signal in a secondaryserving cell and transmit an uplink SRS signal in other serving cell(s)within the same OFDM symbol; and

a first processing unit 112 configured to drop the SRS signal in theother serving cell(s) or puncture symbols of the PRACH signal in thesecondary serving cell within the same OFDM symbol as the SRS signal inthe other serving cell(s) if the determination result of the firstdetermining unit 111 is positive.

In this embodiment, the terminal equipment further includes:

a second determining unit 113 configured to determine whether theterminal equipment needs to transmit a PRACH signal in a secondaryserving cell and transmit a physical uplink channel signal in otherserving cell(s) within the same subframe; and

a second processing unit 114 configured to adjust the transmission powerof the PRACH signal and/or the physical uplink channel signal accordingto a predefined priority order of the PRACH signal and the physicaluplink channel signal when total transmission power is greater thanmaximum output power when it is determined positive by the seconddetermining unit 113, until the adjusted total transmission power isless than or equal to the maximum output power of the terminalequipment.

In an implementation, there is one type of physical uplink channelsignal, and the second processing unit 114 includes:

a first judging module 1141 configured to judge whether the priorityorder of the PRACH signal is the same as that of the physical uplinkchannel signal;

a first processing module 1142 configured to reduce the transmissionpower of the PRACH signal and the physical uplink channel signal by anequal share when the result of judgment of the first judging module 1141is positive, until the adjusted total transmission power is less than orequal to the maximum output power of the terminal equipment; and

a second processing module 1143 configured to satisfy first thetransmission power of the signal with a higher priority order when theresult of judgment of the first judging module 1141 is negative, andthen reduce the transmission power of the signal with a lower priorityorder, until the adjusted total transmission power is less than or equalto the maximum output power of the terminal equipment.

In another implementation, there are two types of physical uplinkchannel signals, and the second processing unit 114 further includes:

a third processing module 1144 configured to satisfy the transmissionpower of the signal with a highest priority order;

a second judging module 1145 configured to judge whether the priorityorders of the rest two signals are the same after the processing of thethird processing module 1144;

a fourth processing module 1146 configured to reduce the transmissionpower of the rest two signals by an equal share when the result ofjudgment of the second judging module 1145 is positive, until theadjusted total transmission power is less than or equal to the maximumoutput power of the terminal equipment;

a third judging module 1147 configured to judge whether the resttransmission power satisfies the transmission power of the signal with asecondary priority order when the result of judgment of the secondjudging module 1145 is negative;

a fifth processing module 1148 configured to satisfy the transmissionpower of the signal with the secondary priority order when the result ofjudgment of the third judging module 1147 is positive, and reduce thetransmission power of the signal with a lowest priority order, until theadjusted total transmission power is less than or equal to the maximumoutput power of the terminal equipment; and

a sixth processing module 1149 configured to set the transmission powerof the signal with the lowest priority order to be 0 when the result ofjudgment of the third judging module 1147 is negative, and allocate therest transmission power to the signal with the secondary priority order.

In still another implementation, there are three types of physicaluplink channel signals, and the second processing unit 114 includes:

a seventh processing module 11410 configured to satisfy the transmissionpower of the signal with a highest priority order;

a fourth judging module 11411 configured to judge whether thetransmission power of the signal with a secondary priority order can besatisfied after the processing of the seventh processing module 11410;

an eighth processing module 11412 configured to allocate the resttransmission power to the signal with a secondary priority order whenthe result of judgment of the fourth judging module 11411 is negative,and set the transmission power of other signals to be 0;

a ninth processing module 11413 configured to satisfy the transmissionpower of the signal with the secondary priority order when the result ofjudgment of the fourth judging module 11411 is positive;

a fifth judging module 11414 configured to judge whether the priorityorders of the rest two signals are the same after the processing of theninth processing module 11413;

a tenth processing module 11415 configured to reduce the transmissionpower of the rest two signals by an equal share when the result ofjudgment of the fifth judging module 11414 is positive, until theadjusted total transmission power is less than or equal to the maximumoutput power of the terminal equipment;

a sixth judging module 11416 configured to judge whether the resttransmission power satisfies the transmission power of the signal with arelatively higher priority order of the two rest signals when the resultof judgment of the fifth judging module 11414 is negative;

an eleventh processing module 11417 configured to satisfy thetransmission power of the signal with the relatively higher priorityorder when the result of judgment of the sixth judging module 11416 ispositive, and reduce the transmission power of the signal with a lowestpriority order, until the adjusted total transmission power is less thanor equal to the maximum output power of the terminal equipment; and

a twelfth processing module 11418 configured to set the transmissionpower of the signal with the lowest priority order to be 0 when theresult of judgment of the sixth judging module 11416 is negative, andallocate the rest transmission power to the signal with the relativelyhigher priority order.

In this embodiment, the physical uplink channel signal may include anycombination of the following signals: a PUCCH signal, a PUSCH signalwith UCI, and a PUSCH with no UCI. Wherein, the priority orders of thePRACH signal, the PUCCH signal, the PUSCH signal with UCI and the PUSCHwith no UCI may be predefined as: the priority order of the PUSCH signalwith no UCI is less than or equal to that of the PRACH signal, thepriority order of the PRACH signal is less than that of the PUSCH signalwith UCI, and the priority order of the PUSCH signal with UCI is lessthan that of the PUCCH signal.

With the terminal equipment of this embodiment, when it is needed totransmit PRACH signals and SRS signals in different serving cells withinthe same OFDM symbol at the same time, the transmission power of theterminal equipment is lowered by dropping the SRS signals andtransmitting only the PRACH signals, or by puncturing the PRACH signalsin the same OFDM symbol as the SRS signals and transmitting only the SRSsignals, and the problem that the total transmission power is greaterthan the configured maximum output power resulted from transmitting SRSsignals and PRACH signals by the terminal equipment in the same OFDMsymbol at the same time is solved. Furthermore, when it is needed totransmit PRACH signals in an SCell and transmit physical uplink channelsignals in other cell(s) within the same subframe, the terminalequipment may determine a power control policy according to the priorityorders of the PRACH signals and each physical uplink channel signal, soas to ensure that the total transmission power is less than or equal tothe maximum output power of the terminal equipment, thereby providing apractical and feasible power control method for a scenario newlyoccurred in Rel-11 in which the power of the terminal equipment islimited.

An embodiment of the present invention further provides terminalequipment, as described in Embodiment 6 below. As the principle of theterminal equipment for solving problem is similar to that of the methodin embodiments 3 and 4, the implementation of the method in embodiments3 and 4 may be referred to for the implementation of the terminalequipment, and the repeated parts shall not be described any further.

Embodiment 6

FIG. 12 is a schematic diagram of the structure of terminal equipmentprovided by an embodiment of the present invention. Referring to FIG.12, the terminal equipment includes:

a first determining unit 121 configured to determine whether theterminal equipment needs to transmit a PRACH signal in a secondaryserving cell and transmit an uplink SRS signal in other serving cell(s)within the same OFDM symbol;

a first judging unit 122 configured to judge whether total transmissionpower is greater than maximum output power of the terminal equipmentwhen it is determined positive by the first determining unit 121; and

a first processing unit 123 configured to adjust the transmission powerof the PRACH signal and the SRS signal according to the priority ordersof the PRACH signal and the SRS signal when the result of judgment ofthe first judging unit 122 is positive.

In an embodiment, the first processing unit 123 includes:

a first judging module 1231 configured to judge whether the maximumoutput power of the terminal equipment satisfies the transmission powerof the SRS signal;

a first processing module 1232 configured to satisfy the transmissionpower of the SRS signal when the result of judgment of the first judgingmodule 1231 is positive, and allocate the rest transmission power to thePRACH signal; and

a second processing module 1233 configured to set the transmission powerof the PRACH signal to be 0 when the result of judgment of the firstjudging module 1231 is negative, and allocate the maximum output powerto all the SRS signals by an equal share.

In this embodiment, the terminal equipment further includes:

a second determining unit 124 configured to determine whether theterminal equipment needs to transmit a PRACH signal in a secondaryserving cell and transmit a physical uplink channel signal in otherserving cell(s) within the same subframe;

a second judging unit 125 configured to judge whether the totaltransmission power is greater than the maximum output power of theterminal equipment when it is determined positive by the seconddetermining unit 124; and

a second processing unit 126 configured to adjust the transmission powerof the PRACH signal or adjust the transmission power of the PRACH signaland the physical uplink channel signal according to predefined priorityorders of the PRACH signal and the physical uplink channel signal whenit is determined positive by the second judging unit 125, until theadjusted total transmission power is less than or equal to the maximumoutput power of the terminal equipment.

In an embodiment, there is one type of physical uplink channel signal,and the second processing unit 126 includes:

a second judging module 1261 configured to judge whether the maximumoutput power of the terminal equipment satisfies the transmission powerof the signal with a higher priority order;

a third processing module 1262 configured to satisfy the transmissionpower of the signal with the higher priority order when the result ofjudgment of the second judging module 1261 is positive, and allocate therest transmission power to the signal with a lower priority order; and

a fourth processing module 1263 configured to set the transmission powerof the signal with the lower priority order to be 0 when the result ofjudgment of the second judging module 1261 is negative, and allocate therest transmission power to the signal with the higher priority order.

In another embodiment, there are two types of physical uplink channelsignals, and the second processing unit 126 includes:

a fifth processing module 1264 configured to satisfy the transmissionpower of the signal with a highest priority order;

a third judging module 1265 configured to judge whether the resttransmission power satisfies the transmission power of the signal with asecondary priority order after the processing of the fifth processingmodule 1264;

a sixth processing module 1266 configured to satisfy the transmissionpower of the signal with a secondary priority order when the result ofjudgment of the third judging module 1265 is positive, and then allocatethe rest transmission power to the signal with a lowest priority order;and

a seventh processing module 1267 configured to set the transmissionpower of the signal with the lowest priority order to be 0 when theresult of judgment of the third judging module 1265 is negative, andallocate the rest transmission power to the signal with the secondarypriority order.

In still another embodiment, there are three types of physical uplinkchannel signals, and the second processing unit 126 includes:

an eighth processing module 1268 configured to satisfy the transmissionpower of the signal with a highest priority order;

a fourth judging module 1269 configured to judge whether the resttransmission power satisfies the transmission power of the signal with asecondary priority order after the processing of the eighth processingmodule 1268;

a ninth processing module 12610 configured to allocate the resttransmission power to the signal with the secondary priority order whenthe result of judgment of the fourth judging module 1269 is negative,and set the transmission power of the rest signals to be 0;

a tenth processing module 12611 configured to satisfy the transmissionpower of the signal with the secondary priority order when the result ofjudgment of the fourth judging module 1269 is positive;

a fifth judging module 12612 configured to judge whether the resttransmission power satisfies the signal with a third priority orderafter the processing of the tenth processing module 12611;

an eleventh processing module 12613 configured to satisfy thetransmission power of the signal with the third priority order when theresult of judgment of the fifth judging module 12612 is positive, andthen allocate the rest transmission power to the signal with a lowestpriority order; and

a twelfth processing module 12614 configured to set the transmissionpower of the signal with the lowest priority order to be 0 when theresult of judgment of the fifth judging module 12612 is negative, andallocate the rest transmission power to the signal with the thirdpriority order.

In this embodiment, the physical uplink channel signal may include anycombination of the following signals: a PUCCH signal, a PUSCH signalwith UCI, and a PUSCH with no UCI. Wherein, the priority orders of thePRACH signal, the PUCCH signal, the PUSCH signal with UCI and the PUSCHwith no UCI may be predefined as: the priority order of the PRACH signalis less than that of the PUSCH signal with no UCI, the priority order ofthe PUSCH signal with no UCI is less than that of the PUSCH signal withUCI, and the priority order of the PUSCH signal with UCI is less thanthat of the PUCCH signal.

With the terminal equipment of this embodiment, when it is needed totransmit PRACH signals and SRS signals in different serving cells withinthe same OFDM symbol at the same time, the terminal equipment lowers thetransmission power of the signal of relatively lower priority order, soas to ensure that the total transmission power is less than or equal tothe maximum output power of the terminal equipment, thereby solving theproblem that the total transmission power is greater than the configuredmaximum output power resulted from transmitting SRS signals and PRACHsignals by the terminal equipment in the same OFDM at the same time.Furthermore, when it is needed to transmit PRACH signals in an SCell andtransmit physical uplink channel signals in other cell(s) within thesame subframe, the terminal equipment may determine a power controlpolicy according to the priority orders of the PRACH signals and eachphysical uplink channel signal, so as to ensure that the totaltransmission power is less than or equal to the maximum output power ofthe terminal equipment, thereby providing a practical and feasible powercontrol method for a scenario newly occurred in Rel-11 in which thepower of the terminal equipment is limited.

An embodiment of the present invention further provides acomputer-readable program, wherein when the program is executed interminal equipment, the program enables a computer to carry out thepower control method as described in embodiments 1-4 in the terminalequipment.

An embodiment of the present invention further provides a storage mediumin which a computer-readable program is stored, wherein thecomputer-readable program enables a computer to carry out the powercontrol method as described in embodiments 1-4 in terminal equipment.

The above apparatuses and methods of the present invention may beimplemented by hardware, or by hardware in combination with software.The present invention relates to such a computer-readable program thatwhen the program is executed by a logic device, the logic device isenabled to carry out the apparatus or components as described above, orto carry out the methods or steps as described above. The presentinvention also relates to a storage medium for storing the aboveprogram, such as a hard disk, a floppy disk, a CD, a DVD, and a flashmemory, etc.

The present invention is described above with reference to particularembodiments. However, it should be understood by those skilled in theart that such a description is illustrative only, and not intended tolimit the protection scope of the present invention. Various variantsand modifications may be made by those skilled in the art according tothe spirits and principle of the present invention, and such variantsand modifications fall within the scope of the present invention.

What is claimed is:
 1. A user equipment comprising: a transmitterconfigured to transmit uplink signals; and a processor circuit coupledwith the transmitter, the processor circuit configured to: drop aSounding Reference Signal (SRS) transmission when a total transmissionpower exceeds maximum output power of the user equipment and the userequipment needs to transmit a Physical Random Access Channel (PRACH)signal in a secondary serving cell in parallel with the SRS transmissionin a symbol on a subframe of a different serving cell; and adjusttransmission power of a Physical Uplink Shared Channel (PUSCH) signaluntil an adjusted total transmission power is less than or equal to themaximum output power of the user equipment when the user equipment needsto transmit a PRACH signal in a secondary serving cell in parallel witha PUSCH signal in a different serving cell within a symbol.